How can you tell the difference between a 400 and 455?
How can you tell the difference between a 400 and 455?
The significant difference internally between the 400 and the 455, as you probably know, is the diameter of the main bearing journal on the crank – the 400 being 3.000″ and the 455 being 3.250″.
When did Pontiac stop making the Firebird 400?
The 400 V-8 and the Firebird 400 package did continue into 1969, but the Firebird itself changed substantially enough that year to warrant its own separate consideration. So if you’re considering buying a 1967-1968 Firebird 400, here’s what you should look for.
When did the Pontiac 400 V8 come out?
Pontiac 400 V8 Engine. The Pontiac 400 6.6 Liter engine was first introduced in 1967. This version of the Pontiac V8 engine was used in the GTO, Firebird, and the Trans-Am Firebird. The 400 was inspired by the Pontiac 389 V8 and proved to be the last Pontiac engine with closed chambered heads.
What kind of engine did the Pontiac Firebird have?
Backing the big V-8 was the B-O-P version of the Turbo Hydra-Matic 400 three-speed automatic. The 400 V-8 and the Firebird 400 package did continue into 1969, but the Firebird itself changed substantially enough that year to warrant its own separate consideration.
What was the gear ratio on a 1967 Firebird 400?
DIFFERENTIAL The 1967 Firebird 400 could have come with any of the Firebird’s range of rear gear ratios in the B-O-P 10-bolt differential, from a 2.56 through a 3.90. Firebird 400 buyers who ordered a 3.90:1 gear ratio–which was required with the Ram Air version–could only get that ratio with a Saf-T-Track limited-slip differential.
The 400 V-8 and the Firebird 400 package did continue into 1969, but the Firebird itself changed substantially enough that year to warrant its own separate consideration. So if you’re considering buying a 1967-1968 Firebird 400, here’s what you should look for.
Pontiac 400 V8 Engine. The Pontiac 400 6.6 Liter engine was first introduced in 1967. This version of the Pontiac V8 engine was used in the GTO, Firebird, and the Trans-Am Firebird. The 400 was inspired by the Pontiac 389 V8 and proved to be the last Pontiac engine with closed chambered heads.
How much horsepower does a Pontiac Firebird have?
ENGINES One of GM’s many corporate edicts in the 1960s restricted the maximum output of any production car to one horsepower per 10 pounds. With a target weight of 3,250 pounds for the 1967 Firebird 400, that meant Pontiac would have to restrict the 400-cu.in. V-8 to 325hp.
What is the date code on a Pontiac 400?
The block casting number, 9790071, is for a 1968-1969 400 engine. The date code is 4 digits. The first digit is the month, the next 2 digits are the day of the month, and the last digit is the year (6 could be 1966 or 1976).
